Dry burning prevention control method and device for heat pump water heater, heat pump water heater and medium

Abstract

The invention provides a dry burning prevention control method and device for a heat pump water heater, the heat pump water heater and a computer readable storage medium, and relates to the technical field of heat pump water heaters. Judging whether the heat pump water heater has a suspected dry burning risk or not; under the condition that the heat pump water heater has the suspected dry burning risk, the authenticity that the heat pump water heater has the dry burning risk is verified according to the actual heat exchange amount and the theoretical heat exchange amount of the heat pump water heater under the same working condition parameters; and under the condition that the authenticity verification of the dry burning risk of the heat pump water heater is passed, the heat pump water heater is controlled to execute anti-dry burning protection operation. According to the method and the device, false triggering of dry burning protection under the condition that water exists in the water storage tank is effectively avoided, and the accuracy and the reliability of dry burning detection are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of heat pump water heater technology, and more specifically, to a heat pump water heater anti-dry-burning control method, device, heat pump water heater, and computer-readable storage medium in the field of heat pump water heater technology. Background Technology

[0002] Heat pump water heaters are prone to dry burning when powered on in a water-free or water-scarce state, leading to compressor overheating, system overpressure, component damage, and even safety hazards. Existing dry burning detection logic typically judges whether the water tank temperature rise exceeds a preset threshold within a fixed time interval: if the temperature rise exceeds the threshold, it is judged as dry burning and a protective shutdown is triggered. While this method is simple to implement, it is prone to false alarms. For example, when a user uses a large amount of hot water and the water level in the tank becomes insufficient, the system rapidly injects low-temperature cold water into the tank. At this time, the high-temperature gaseous refrigerant in the heat exchanger in the tank undergoes violent heat exchange with the newly injected cold water, which may cause the water tank temperature to rise rapidly and instantaneously (i.e., a temperature jump). This can lead the system to mistakenly judge it as dry burning, thus triggering an unnecessary protective shutdown and affecting the user experience. Summary of the Invention

[0003] This application provides a method, device, heat pump water heater, and computer-readable storage medium for preventing dry burning in a heat pump water heater. When a suspected dry burning risk is initially detected in the heat pump water heater, this application further verifies the authenticity of the dry burning risk by comparing the actual heat exchange and theoretical heat exchange of the heat pump water heater. This can effectively avoid misjudgment of dry burning and significantly improve the accuracy and reliability of dry burning detection.

[0004] Firstly, a method for preventing dry-burning in a heat pump water heater is provided. This method includes: when the heat pump water heater is running, determining whether there is a suspected risk of dry-burning based on the outdoor ambient temperature, the upper temperature of the water tank, and the lower temperature of the water tank; if there is a suspected risk of dry-burning, verifying the authenticity of the risk by comparing the actual heat exchange with the theoretical heat exchange under the same operating parameters; and if the verification of the risk of dry-burning is successful, controlling the heat pump water heater to perform an anti-dry-burning protection operation.

[0005] This application employs a technical solution that, while the heat pump water heater is operating, determines whether there is a suspected risk of dry burning based on the outdoor ambient temperature, the upper temperature of the water tank, and the lower temperature of the water tank. If a suspected risk of dry burning is detected, the actual heat exchange rate and theoretical heat exchange rate of the heat pump water heater under the same operating parameters are compared to verify the existence of the risk. Once the verification of the dry burning risk is successful, the heat pump water heater is controlled to perform anti-dry burning protection. This two-stage judgment mechanism, which first detects whether there is a suspected risk of dry burning and then verifies whether the risk actually exists, effectively avoids false triggering of dry burning protection when there is water in the water tank, significantly improving the accuracy and reliability of dry burning detection.

[0006] In one possible implementation, determining whether a heat pump water heater has a suspected risk of dry burning based on the outdoor ambient temperature, the temperature of the upper part of the water tank, and the temperature of the lower part of the water tank includes: determining at each first time interval whether the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature, wherein the target temperature difference is the difference between the smaller value of the upper and lower temperatures of the water tank at the first time and the smaller value of the upper and lower temperatures of the water tank at the second time, the second time being before the first time, and the first time interval being the difference between the first and second times; if the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature, and the first consecutive cumulative number of times the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature is greater than or equal to the first number threshold, it is determined that the heat pump water heater has a suspected risk of dry burning.

[0007] In one possible implementation, verifying the authenticity of the risk of dry burning of the heat pump water heater based on the actual and theoretical heat exchange rates under the same operating parameters includes: when there is a suspected risk of dry burning, after a second time interval, acquiring the first operating parameters and determining the first actual and first theoretical heat exchange rates under the first operating parameters. The first operating parameters include the average values ​​of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature at the time the second time interval is reached; if the first condition is met, data is acquired every third time interval. The second operating condition parameters are determined, including the second actual heat exchange and the second theoretical heat exchange under these parameters. The first condition includes that the first actual heat exchange is greater than or equal to the first product, which is the product of the first heat exchange correction coefficient and the second theoretical heat exchange. The first heat exchange correction coefficient is greater than 1. The second operating condition parameters include the average values ​​of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature at the arrival of the third time interval. Based on the second actual heat exchange and the second theoretical heat exchange determined at each third time interval, the authenticity of the risk of dry burning in the heat pump water heater is verified.

[0008] In one possible implementation, verifying the authenticity of the heat pump water heater's dry-burning risk based on the second actual heat exchange and the second theoretical heat exchange determined at each third time interval includes: if a second condition is met, the verification of the heat pump water heater's dry-burning risk is deemed successful. The second condition includes that the second actual heat exchange determined at each third time interval is greater than or equal to the second product, and the second consecutive cumulative number of times the second actual heat exchange determined at each third time interval is greater than or equal to the second product is greater than or equal to the second threshold number. The second product is the product of the second heat exchange correction coefficient and the second theoretical heat exchange, and the second heat exchange correction coefficient is greater than 1. If the second condition is not met, the verification of the heat pump water heater's dry-burning risk is deemed unsuccessful.

[0009] In one possible implementation, the heat pump water heater anti-dry-burning control method further includes: under the condition of satisfying the second condition, acquiring the third operating condition parameters every fourth time interval, and determining the third actual heat exchange and the third theoretical heat exchange under the third operating condition parameters, wherein the third operating condition parameters include the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature and lower water tank temperature when the fourth time interval arrives; and verifying the authenticity of the heat pump water heater's dry-burning risk based on the third actual heat exchange and the third theoretical heat exchange determined every fourth time interval.

[0010] In one possible implementation, the verification of the existence of a dry-burning risk in the heat pump water heater is based on the third actual heat exchange and the third theoretical heat exchange determined at each fourth time interval. This includes: if the third condition is met, the verification of the existence of a dry-burning risk in the heat pump water heater is deemed successful; if the third condition is not met, the verification of the existence of a dry-burning risk in the heat pump water heater is deemed unsuccessful. The third condition includes that the third actual heat exchange determined at each fourth time interval is greater than or equal to the third product, and the third consecutive cumulative number of times the third actual heat exchange determined at each fourth time interval is greater than or equal to the third product is greater than or equal to the third number threshold. The third product is the product of the third heat exchange correction coefficient and the third theoretical heat exchange, and the third heat exchange correction coefficient is greater than 1.

[0011] In one possible implementation, the heat pump water heater anti-dry-burning control method further includes: when there is a suspected risk of dry burning in the heat pump water heater, increasing the first duration to obtain a second duration; when the first condition is met, increasing the second duration to obtain a third duration; and when the second condition is met, increasing the third duration to obtain a fourth duration.

[0012] Secondly, a heat pump water heater anti-dry-burning control device is provided, the heat pump water heater anti-dry-burning control device comprising:

[0013] The risk assessment module is used to determine whether there is a potential risk of dry burning of the heat pump water heater when it is running, based on the outdoor ambient temperature, the temperature of the upper part of the water tank and the temperature of the lower part of the water tank. The risk verification module is used to verify the authenticity of the risk of dry burning of the heat pump water heater by comparing the actual heat exchange and theoretical heat exchange under the same operating parameters when there is a suspected risk of dry burning. The safety protection module is used to control the heat pump water heater to perform anti-dry-burning protection operation if the authenticity verification of the risk of dry burning in the heat pump water heater is passed.

[0014] Thirdly, a heat pump water heater is provided, including a memory and a processor. The memory is used to store executable program code, and the processor is used to call and run the executable program code from the memory, causing the heat pump water heater to perform the heat pump water heater anti-dry-burning control method in the first aspect or any possible implementation thereof.

[0015] Fourthly, a computer program product is provided, comprising: computer program code, which, when executed on a computer, causes the computer to perform the heat pump water heater anti-dry-burning control method described in the first aspect or any possible implementation thereof.

[0016] Fifthly, a computer-readable storage medium is provided, which stores computer program code that, when executed on a computer, causes the computer to perform the heat pump water heater anti-dry-burning control method described in the first aspect or any possible implementation thereof. Attached Figure Description

[0017] Figure 1 This paper presents a schematic flowchart of a heat pump water heater anti-dry-burning control method according to an embodiment of the present application; Figure 2 This paper shows a system schematic diagram of a heat pump water heater according to an embodiment of the present application; Figure 3 This paper shows another schematic flowchart of a heat pump water heater anti-dry burning control method provided in an embodiment of this application; Figure 4 This illustration shows a structural schematic diagram of a heat pump water heater anti-dry-burning control device provided in an embodiment of this application; Figure 5 A schematic diagram of the structure of a heat pump water heater provided in an embodiment of this application is shown. Detailed Implementation

[0018] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0019] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0020] Heat pump water heaters are prone to dry burning when powered on in a water-free or water-scarce state, leading to compressor overheating, system overpressure, component damage, and even safety hazards. Existing dry burning detection logic typically judges whether the water tank temperature rise exceeds a preset threshold within a fixed time interval: if the temperature rise exceeds the threshold, it is judged as dry burning and a protective shutdown is triggered. While this method is simple to implement, it is prone to false alarms. For example, when a user uses a large amount of hot water and the water level in the tank becomes insufficient, the system rapidly injects low-temperature cold water into the tank. At this time, the high-temperature gaseous refrigerant in the heat exchanger in the tank undergoes violent heat exchange with the newly injected cold water, which may cause the water tank temperature to rise rapidly and instantaneously (i.e., a temperature jump). This can lead the system to mistakenly judge it as dry burning, thus triggering an unnecessary protective shutdown and affecting the user experience.

[0021] To address the aforementioned issues, this application provides a method, apparatus, heat pump water heater, and computer-readable storage medium for preventing dry-burning in a heat pump water heater. During operation, this application first detects whether there is a suspected risk of dry-burning. If such a risk is detected, the actual heat exchange rate is compared with the theoretical heat exchange rate to verify the existence of the risk. If the verification confirms the risk, the heat pump water heater is shut down to provide dry-burning protection. Thus, by employing a two-stage judgment mechanism—first detecting a suspected risk, then verifying its existence—this application effectively avoids false triggering of dry-burning protection when there is water in the storage tank, significantly improving the accuracy and reliability of dry-burning detection.

[0022] The following is an embodiment of a method for preventing dry burning in a heat pump water heater provided in this application specification.

[0023] Figure 1A schematic flowchart of a heat pump water heater anti-dry-burning control method provided in an embodiment of this application is shown, as follows: Figure 1 As shown in the embodiment of this application, the heat pump water heater is the subject of the anti-dry burning control method for heat pump water heaters. Figure 2 This application provides a system schematic diagram of a heat pump water heater according to an embodiment of the present application. Figure 2 As shown, the heat pump water heater includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an electronic expansion valve 4, a water storage tank 5, a high-pressure switch HP, a low-pressure switch LP, etc. The compressor 1, four-way valve 2, outdoor heat exchanger 3, electronic expansion valve 4, water storage tank 5, high-pressure switch HP, low-pressure switch LP, etc., are arranged according to... Figure 2 The connection is shown in the figure. Where Tp represents the exhaust temperature of compressor 1, Th represents the return gas temperature of compressor 1, T4 represents the outdoor ambient temperature, T3 represents the inlet temperature of outdoor heat exchanger 3, T5U represents the upper temperature of water tank 5, T5L represents the lower temperature of water tank 5, Twin represents the water inlet of water tank 5, and Tout represents the water outlet of water tank 5. Figure 2 C, D, E, and S are the four ports of the four-way valve 2. Specifically, port C (Common) of the four-way valve 2 is connected to the outdoor heat exchanger 3; port D (Discharge) of the four-way valve 2 is connected to the exhaust port of the compressor 1; port E (Evaporator) of the four-way valve 2 is connected to the heat exchanger in the water storage tank 5; and port S (Suction) of the four-way valve 2 is connected to the return port of the compressor 1.

[0024] The heat pump water heater anti-dry-burning control method provided in this application includes the following solutions: S110: When the heat pump water heater is running, determine whether there is a suspected risk of dry burning of the heat pump water heater based on the outdoor ambient temperature, the temperature of the upper part of the water tank and the temperature of the lower part of the water tank. If yes, execute S120; if no, continue to execute S110. S120: In the case of a suspected risk of dry burning in a heat pump water heater, the actual heat exchange and theoretical heat exchange of the heat pump water heater under the same operating parameters are used to verify the authenticity of the risk of dry burning. S130: If the verification of the actual risk of dry burning of the heat pump water heater is passed, control the heat pump water heater to perform the anti-dry burning protection operation.

[0025] In an exemplary embodiment, when the heat pump water heater starts operating and heats the cold water in the storage tank, the outdoor ambient temperature, the upper temperature of the water tank, and the lower temperature of the water tank are acquired. These temperatures are then combined to determine if the heat pump water heater has a suspected risk of dry burning. If a suspected risk of dry burning is determined, there are two possible scenarios: first, the storage tank is indeed empty, leading to an initial detection of a dry burning risk; second, the storage tank contains water, but a dry burning risk is still detected. Therefore, after an initial determination of a suspected dry burning risk, the anti-dry burning protection operation is not immediately executed; further verification is needed to confirm whether the dry burning risk actually exists.

[0026] Specific heat capacity of water C P水 = 2×10 -5 ×T5average 2 - 0.0018 × T5 average + 4.2185, specific heat capacity of air C P空气 = 0.00001 × T5average + 1.0048, where T5average is the average temperature of the upper and lower parts of the water tank. The actual heat exchange capacity of a heat pump water heater is expressed as Q. AIR Q AIR The calculation formula is as follows: Q AIR =(C P ×M×(T5average(t2)-T5average(t1))) / (△t×60), where t2 is after t1, △t=t2-t1, and M represents the volume of the water tank, specifically the theoretical volume.

[0027] The actual heat exchange capacity of a heat pump water heater is expressed as Q. HP Q HP The theoretical fitting empirical value for a heat pump water heater under different operating conditions, compressor operating frequencies, and water temperatures can be calculated by substituting the average values ​​of the compressor frequency, the upper temperature of the water tank, and the lower temperature of the water tank, along with the outdoor ambient temperature, into the theoretical fitting empirical formula. HP Q HP =(Fr, T5average, T4), where Fr represents the compressor operating frequency. The corresponding Q can be obtained by mapping the average values ​​of the compressor frequency, the upper temperature of the water tank, the lower temperature of the water tank, and the outdoor ambient temperature. HP The same operating parameters mentioned above include compressor frequency, upper water tank temperature, lower water tank temperature, and outdoor ambient temperature.

[0028] There is a specific heat capacity difference coefficient Ck between water and air, Ck=C P水 / C P空气 Because of the specific heat capacity difference coefficient Ck, if there is no water in the storage tank of the heat pump water heater (i.e., it is all air), the actual heat exchange of the heat pump water heater under the same operating parameters will definitely be greater than the theoretical heat exchange. If there is water in the storage tank of the heat pump water heater, the actual heat exchange of the heat pump water heater under the same operating parameters will definitely be less than the theoretical heat exchange.

[0029] After initially determining that the heat pump water heater has a suspected risk of dry burning, the actual heat exchange rate and theoretical heat exchange rate of the heat pump water heater under the same operating parameters are calculated. The actual heat exchange rate and theoretical heat exchange rate are compared to obtain the comparison result. Then, the authenticity of the heat pump water heater's dry burning risk is verified based on the comparison result. If the verification of the authenticity of the heat pump water heater's dry burning risk fails, it means that the initial detection result of the suspected dry burning risk of the heat pump water heater is not true, that is, a misjudgment has occurred. In this case, there is water in the storage tank. If the verification of the authenticity of the heat pump water heater's dry burning risk passes, it means that the initial detection result of the suspected dry burning risk of the heat pump water heater is true. In this case, there is no water in the storage tank. Therefore, it is determined that the heat pump water heater has a confirmed risk of dry burning, and a dry burning alarm is output, controlling the heat pump water heater to shut down to achieve dry burning protection.

[0030] This application employs a technical solution that, while the heat pump water heater is operating, determines whether there is a suspected risk of dry burning based on the outdoor ambient temperature, the upper temperature of the water tank, and the lower temperature of the water tank. If a suspected risk of dry burning is detected, the actual heat exchange rate and theoretical heat exchange rate of the heat pump water heater under the same operating parameters are compared to verify the existence of the risk. Once the verification of the dry burning risk is successful, the heat pump water heater is controlled to perform anti-dry burning protection. This two-stage judgment mechanism, which first detects whether there is a suspected risk of dry burning and then verifies whether the risk actually exists, effectively avoids false triggering of dry burning protection when there is water in the water tank, significantly improving the accuracy and reliability of dry burning detection.

[0031] In one possible implementation, the above-mentioned method of determining whether a heat pump water heater has a suspected risk of dry burning based on the outdoor ambient temperature, the temperature of the upper part of the water tank, and the temperature of the lower part of the water tank includes the following steps: At each first time interval, it is determined whether the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature. The target temperature difference is the difference between the smaller value of the upper temperature and the lower temperature of the water tank at the first time and the smaller value of the upper temperature and the lower temperature of the water tank at the second time. The second time is before the first time, and the first time interval is the difference between the first time and the second time. If the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature, and the first consecutive cumulative number of times the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature is greater than or equal to the first number threshold, it is determined that the heat pump water heater has a suspected risk of dry burning.

[0032] The specific process for determining whether a heat pump water heater has a potential risk of dry burning is as follows: Set a first duration, for example, select any duration from 3 to 10 minutes to obtain the first duration. If it is determined that the heat pump water heater has a suspected risk of dry burning, first obtain the outdoor ambient temperature T4, the upper temperature of the water tank T5U, and the lower temperature of the water tank T5L. The time when the outdoor ambient temperature T4, the upper temperature of the water tank T5U, and the lower temperature of the water tank T5L are obtained is called the second time. Then, after the first duration, obtain the outdoor ambient temperature T4, the upper temperature of the water tank T5U, and the lower temperature of the water tank T5L again. The time when the outdoor ambient temperature T4, the upper temperature of the water tank T5U, and the lower temperature of the water tank T5L are obtained again is called the first time. That is, the second time is before the first time, and the first duration = the first time - the second time.

[0033] After obtaining the temperature data at the first and second time points, the smaller value between the upper temperature T5U and the lower temperature T5L of the water tank at the first and second time points is determined. Specifically, the smaller value between the upper temperature T5U and the lower temperature T5L at the first time point is T15min(t3) = min(upper temperature T5U and lower temperature T5L at the first time point), and the smaller value between the upper temperature T5U and the lower temperature T5L at the second time point is T15min(t) = min(upper temperature T5U and lower temperature T5L at the second time point). After obtaining T15min(t3) and T15min(t), the target temperature difference is expressed as V△T15min(t3), where V△T15min(t3) = T15min(t3) - T15min(t).

[0034] Different temperature difference thresholds are pre-set for different outdoor ambient temperatures T4, denoted as k. For example, if T4 < 2℃, k = a1; 2 ≤ T4 < 7℃, k = a2; 7 ≤ T4 < 25℃, k = a3; T4 ≥ 25℃, k = a4; where a1 < a2 < a3 < a4. If the current outdoor ambient temperature T4 is 24℃, k is set to a3.

[0035] After obtaining the target temperature difference V△T15min(t3), compare V△T15min(t3) with k corresponding to T4. If V△T15min(t3) ≥ k, increment the count value of the first counter (initial value is 0) by 1, at which point the total value is 1. Then, after a first time interval, obtain the outdoor ambient temperature T4, the upper temperature T5U of the water tank, and the lower temperature T5L of the water tank. This yields the outdoor ambient temperature T4, the upper temperature T5U of the water tank, and the lower temperature T5L of the water tank at the third time point. Based on the calculation process of V△T15min(t3), obtain V△T15min(t6). If V△T15min(t6)≥k, the count value of the first counter is incremented by 1, and the total value is 2. Then, after the first time interval, the outdoor ambient temperature T4, the upper temperature T5U of the water tank, and the lower temperature T5L of the water tank are obtained to obtain the outdoor ambient temperature T4, the upper temperature T5U of the water tank, and the lower temperature T5L of the water tank at the fourth time. Based on the calculation process of V△T15min(t3), V△T15min(t9) is obtained. If V△T15min(t9)≥k, the count value of the first counter is incremented by 1, and the total value is 3. And so on.

[0036] The total value of the first counter is used as the first consecutive cumulative count. If the first consecutive cumulative count is greater than or equal to the first threshold (e.g., 10 times), it means that the judgment result that the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature has occurred multiple times consecutively. Therefore, it is determined that the heat pump water heater has a suspected risk of dry burning. The purpose of comparing the first consecutive cumulative count with the first threshold is to avoid misjudging the risk of dry burning due to a single or occasional abnormal fluctuation in water temperature, thereby preventing the false triggering of the anti-dry burning protection shutdown.

[0037] In one possible implementation, the above-mentioned verification of the existence of a dry-burning risk of a heat pump water heater based on the actual heat exchange rate and theoretical heat exchange rate of the heat pump water heater under the same operating parameters includes the following steps: In the event of a suspected dry-burning risk in a heat pump water heater, after a second time interval, the first operating condition parameters are obtained, and the first actual heat exchange and the first theoretical heat exchange under the first operating condition parameters are determined. Under the condition that the first condition is met, the second operating condition parameters are acquired once every third time interval, and the second actual heat exchange and the second theoretical heat exchange under the second operating condition parameters are determined. Based on the second actual heat exchange and the second theoretical heat exchange determined at each third time interval, the authenticity of the risk of dry burning in heat pump water heaters is verified.

[0038] If there is a suspected risk of dry burning in the heat pump water heater, the first duration is increased to obtain a second duration. For example, any duration from 10 to 15 minutes can be selected to obtain the second duration. Then, at the moment when the suspected risk of dry burning in the heat pump water heater is determined, the first first operating condition parameter is obtained. After the second duration, the second first operating condition parameter is obtained. The first first operating condition parameter includes the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature at the moment when the suspected risk of dry burning in the heat pump water heater is determined. The second first operating condition parameter includes the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature when the second duration is reached.

[0039] After obtaining the two first operating condition parameters, the average value of the water tank upper temperature and water tank lower temperature from the first and second first operating condition parameters, and the second duration, are substituted into the above Q. AIR The calculation formula is used to obtain the first actual heat exchange Q1 under the first operating condition parameters. AIR ; Obtain the preset theoretical heat exchange corresponding to the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature in the second first operating condition parameter, and obtain the first theoretical heat exchange Q1 under the first operating condition parameter. HP The first actual heat exchange Q1 was obtained. AIR Heat exchange with the first theory Q1 HP Then, determine the first actual heat exchange Q1. AIR Heat exchange with the first theory Q1 HP Does it meet the first condition? The first condition includes Q1. AIR ≥Ck1×Q1 HP Ck1×Q1 HP This refers to the first product, where Ck1 represents the first heat transfer correction coefficient, which is also a specific heat capacity difference coefficient, referred to here as the first specific heat capacity difference coefficient. Ck1 is greater than 1, and its value is determined based on the outdoor ambient temperature T4. For example, if T4 < 2℃, Ck1 = x1; 2 ≤ T4 < 7℃, Ck1 = x2; 7 ≤ T4 < 25℃, Ck1 = x3; and T4 ≥ 25℃, Ck1 = x4; where x1 < x2 < x3 < x4. If the current outdoor ambient temperature T4 is 24℃, Ck1 is set to x3.

[0040] If the first condition, i.e. Q1, is met. AIR ≥Ck1×Q1 HPThis indicates that the initial verification of the risk of dry burning in the heat pump water heater has passed. To eliminate instantaneous interference or measurement randomness, the heat pump water heater is not immediately shut down. Instead, it is kept running, and in a new sampling period, a second verification of the risk of dry burning is conducted based on a new round of actual heat exchange and theoretical heat exchange. Only if the second verification passes is the risk of dry burning truly confirmed and a protective shutdown is triggered, thereby improving the accuracy and anti-interference capability of dry burning judgment.

[0041] The second verification of whether the heat pump water heater has a risk of dry burning includes: If the first condition is met, the second duration is increased to obtain a third duration. For example, any duration from 15 to 20 minutes is selected to obtain the third duration. Then, at the moment when the first condition is met, the first second operating condition parameter is obtained. After the third duration, the second second operating condition parameter is obtained. The first second operating condition parameter includes the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature at the moment when the first condition is met. The second second operating condition parameter includes the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature when the third duration is reached.

[0042] After obtaining the first and second operating condition parameters, the average values ​​of the upper and lower water tank temperatures from the first and second operating condition parameters, along with the third duration, are substituted into the above Q. AIR The calculation formula is used to obtain the second actual heat exchange Q21 under the second operating condition parameters. AIR ; Obtain the preset theoretical heat exchange corresponding to the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature in the second operating condition parameter, and obtain the second theoretical heat exchange Q21 under the second operating condition parameter. HP That is, to obtain the second actual heat exchange Q21 when the first third duration is reached. AIR Second theoretical heat exchange Q21 HP Therefore, the second actual heat exchange rate Q21 is obtained. AIR Second theoretical heat exchange Q21 HP Then, at the moment when the first third time interval is reached, the third second operating condition parameter is obtained. After the third time interval, the fourth second operating condition parameter is obtained. The third second operating condition parameter includes the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature and lower water tank temperature at the moment when the third time interval is reached. The fourth second operating condition parameter includes the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature and lower water tank temperature at the moment when the second third time interval is reached.

[0043] After obtaining the third and fourth second operating condition parameters, the average values ​​of the water tank upper and lower temperatures and the third duration from the third and fourth second operating condition parameters are substituted into the above Q. AIR The calculation formula is used to obtain the second actual heat exchange Q22 under the second operating condition parameters. AIR ; Obtain the preset theoretical heat exchange corresponding to the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature in the fourth second operating condition parameter, and obtain the second theoretical heat exchange Q22 under the second operating condition parameter. HP That is, to obtain the second actual heat exchange Q22 when the second third duration is reached. AIR Second theoretical heat exchange Q22 HP Therefore, the second actual heat exchange rate, Q22, is obtained. AIR Second theoretical heat exchange Q22 HP Subsequently, based on the second actual heat exchange Q22 AIR Second theoretical heat exchange Q22 HP The calculation method is to calculate the second actual heat exchange Q23 when the third time period is reached. AIR Second theoretical heat exchange Q23 HP The second actual heat exchange Q24 when the fourth third duration is reached. AIR Second theoretical heat exchange Q24 HP By analogy, the second actual heat exchange and the second theoretical heat exchange determined at each third time interval are obtained. Then, based on the second actual heat exchange and the second theoretical heat exchange determined at each third time interval, the authenticity of the heat pump water heater's dry-burning risk is verified, so as to conduct a second verification of whether the heat pump water heater has a dry-burning risk.

[0044] In one possible implementation, the verification of the existence of a dry-burning risk in a heat pump water heater based on the second actual heat exchange and the second theoretical heat exchange determined at every third time interval includes the following steps: If the second condition is met, the verification of the authenticity of the risk of dry burning of the heat pump water heater is passed. If the second condition is not met, the verification of the authenticity of the risk of dry burning of the heat pump water heater is not passed. The second condition includes that the second actual heat exchange determined at every third time interval is greater than or equal to the second product, and the second consecutive cumulative number of times the second actual heat exchange determined at every third time interval is greater than or equal to the second product is greater than or equal to the second threshold number. The second product is the product of the second heat exchange correction coefficient and the second theoretical heat exchange. Here, Ck2 represents the second heat exchange correction coefficient, which is also a specific heat capacity difference coefficient, referred to here as the second specific heat capacity difference coefficient. Ck2 is greater than 1. Ck2 is determined based on the outdoor ambient temperature T4. For example, if T4 < 2℃, Ck2 = x5; 2 ≤ T4 < 7℃, Ck2 = x6; 7 ≤ T4 < 25℃, Ck2 = x7; T4 ≥ 25℃, Ck2 = x8; where x5 < x6 < x7 < x8. If the current outdoor ambient temperature T4 is 24℃, Ck2 is x7.

[0045] After obtaining the second actual heat exchange and the second theoretical heat exchange determined according to the third time interval, if Q21 AIR ≥Ck2×Q21 HP (First second product), set the second counter's count value (initially 0) to increment by 1, at which point the total value is 1; if Q22 AIR ≥Ck2×Q22 HP (Second second product), continue to increment the second counter value by 1, at this point the total value is 2; if Q23 AIR ≥Ck2×Q23 HP (For the third second product), continue incrementing the second counter value by 1, bringing the total value to 3, and so on. Use the total value of the second counter as the second consecutive cumulative count. If the second consecutive cumulative count is greater than or equal to the second threshold (e.g., 5 times), the second condition is met, meaning the verification of the heat pump water heater's potential dry-burning risk is successful. In other words, after the second verification of the heat pump water heater's potential dry-burning risk, it is confirmed that the heat pump water heater truly has a dry-burning risk. If the second condition is not met, return to the step of re-executing the process of determining whether the heat pump water heater has a suspected dry-burning risk based on the outdoor ambient temperature, the upper temperature of the water tank, and the lower temperature of the water tank while the heat pump water heater is running. By performing a second verification of whether the heat pump water heater has a dry-burning risk, the misjudgment of dry-burning detection due to instantaneous interference or measurement randomness can be eliminated, reducing the false trigger rate of the anti-dry-burning protection operation.

[0046] In one possible implementation, the verification of the existence of a dry-burning risk in a heat pump water heater based on the second actual heat exchange and the second theoretical heat exchange determined at every third time interval includes the following steps: Under the condition of satisfying the second condition, the third operating condition parameters are acquired every fourth time interval, and the third actual heat exchange and the third theoretical heat exchange under the third operating condition parameters are determined. The third operating condition parameters include the compressor operating frequency, outdoor ambient temperature, upper water tank temperature and lower water tank temperature at the time the fourth time interval is reached. Based on the third actual heat exchange and the third theoretical heat exchange determined at each fourth time interval, the authenticity of the risk of dry burning of the heat pump water heater is verified.

[0047] Although the first two verifications have significantly reduced the probability of false dry-burning judgments, under complex operating conditions (such as sensor drift and power grid fluctuations), there may still be occasional critical interference situations that meet the dry-burning criteria but are not actually dry-burning. In order to completely eliminate occasional false judgments and ensure the absolute reliability of dry-burning status determination, thereby avoiding unnecessary downtime due to extremely low probability false judgments, it is necessary to introduce a third verification after the second verification of the risk of dry-burning in the heat pump water heater has passed. This will build a "triple verification" mechanism to further improve the robustness and certainty of dry-burning risk judgment.

[0048] The third verification of the risk of dry burning in heat pump water heaters includes: If the second condition is met, the third duration is increased to obtain the fourth duration. For example, any duration between 20 and 25 minutes is selected to obtain the fourth duration. Then, at the moment when the second condition is met, the first third operating condition parameter is obtained. After the fourth duration, the second third operating condition parameter is obtained. The first third operating condition parameter includes the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature at the moment when the second condition is met. The second third operating condition parameter includes the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature when one third duration is reached.

[0049] After obtaining the first and second third operating condition parameters, substitute the average values ​​of the upper and lower water tank temperatures from the first and second third operating condition parameters, along with the fourth duration, into the above Q. AIR The calculation formula yields the third actual heat exchange Q31 under the third operating condition parameters. AIR ; Obtain the preset theoretical heat exchange corresponding to the average values ​​of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature in the second third operating condition parameter, and obtain the third theoretical heat exchange Q31 under the third operating condition parameter. HP That is, to obtain the third actual heat exchange Q31 when the first third duration is reached. AIR Heat exchange with the third theory Q31 HP Therefore, the third actual heat exchange rate, Q31, is obtained. AIRHeat exchange with the third theory Q31 HP Then, at the moment when the first fourth time interval is reached, the third third operating condition parameter is obtained. After the fourth time interval, the fourth third operating condition parameter is obtained. The third third operating condition parameter includes the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature and lower water tank temperature at the moment when the fourth time interval is reached. The fourth third operating condition parameter includes the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature and lower water tank temperature at the moment when the second fourth time interval is reached.

[0050] After obtaining the third and fourth operating condition parameters, the average values ​​of the upper and lower water tank temperatures and the third duration from the third and fourth operating condition parameters are substituted into the above Q. AIR The calculation formula yields the third actual heat exchange Q32 under the third operating condition parameters. AIR ; Obtain the preset theoretical heat exchange corresponding to the average values ​​of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature in the fourth third operating condition parameter, and obtain the third theoretical heat exchange Q32 under the third operating condition parameter. HP That is, to obtain the third actual heat exchange Q32 when the second fourth duration is reached. AIR Heat exchange with the third theory Q32 HP Therefore, the third actual heat exchange rate, Q32, is obtained. AIR Heat exchange with the third theory Q32 HP Subsequently, based on the third actual heat exchange Q32 AIR Heat exchange with the third theory Q32 HP The calculation method is to calculate the third actual heat exchange Q33 when the third fourth time period is reached. AIR Heat exchange with the third theory Q33 HP The third actual heat exchange Q34 when the fourth duration is reached. AIR Heat exchange with the third theory Q34 HP By analogy, the third actual heat exchange and the third theoretical heat exchange determined at each fourth time interval are obtained. Then, based on the third actual heat exchange and the third theoretical heat exchange determined at each fourth time interval, the authenticity of the heat pump water heater's dry-burning risk is verified, so as to conduct a third verification of whether the heat pump water heater has a dry-burning risk.

[0051] In one possible implementation, the verification of the existence of a dry-burning risk in a heat pump water heater based on the third actual heat exchange and the third theoretical heat exchange determined at every fourth time interval includes the following steps: If the third condition is met, the verification of the authenticity of the heat pump water heater's risk of dry burning is passed. Without meeting the third condition, the verification of the existence of a risk of dry burning in the heat pump water heater was not successful.

[0052] The third condition includes that the third actual heat exchange determined at every fourth time interval is greater than or equal to the third product, and the third consecutive cumulative number of times the third actual heat exchange determined at every fourth time interval is greater than or equal to the third product is greater than or equal to the third threshold. The third product is the product of the third heat exchange correction coefficient and the third theoretical heat exchange. Here, Ck3 represents the third heat exchange correction coefficient, which is also a specific heat capacity difference coefficient, referred to here as the third specific heat capacity difference coefficient. Ck3 is greater than 1, and Ck3 is determined based on the outdoor ambient temperature T4. For example, if T4 < 2℃, Ck3 = x9; 2 ≤ T4 < 7℃, Ck3 = x10; 7 ≤ T4 < 25℃, Ck3 = x11; T4 ≥ 25℃, Ck3 = x12; where x9 < x10 < x11 < x12. If the current outdoor ambient temperature T4 is 24℃, Ck3 is x11. Furthermore, the values ​​of Ck1, Ck2, and Ck3 can be the same or different. In cases where the three are different, for example, Ck1 < Ck2 < Ck3.

[0053] After obtaining the third actual heat exchange and the third theoretical heat exchange determined at each fourth time interval, if Q31 AIR ≥Ck3×Q31 HP (First third product), set the count value of the third counter (initial value is 0) to increment by 1, at which point the total value is 1; if Q32 AIR ≥Ck3×Q32 HP (The second and third products), continue to increment the count value of the third counter by 1, at which point the total value is 2; if Q33 AIR ≥Ck3×Q33 HP (The third product) Continue incrementing the third counter value by 1, bringing the total value to 3, and so on. Use the total value of the third counter as the third consecutive cumulative count. If the third consecutive cumulative count is greater than or equal to the third threshold (e.g., 5 times), the third condition is met, meaning the verification of the heat pump water heater's potential dry-burning risk has been passed. In other words, after the third verification of the heat pump water heater's potential dry-burning risk, it is clearly confirmed that the heat pump water heater truly has a dry-burning risk. If the third condition is not met, return to the step of re-executing the process of determining whether the heat pump water heater has a suspected dry-burning risk based on the outdoor ambient temperature, the upper temperature of the water tank, and the lower temperature of the water tank while the heat pump water heater is running. By performing a third verification of whether the heat pump water heater has a dry-burning risk, the misjudgment of dry-burning detection due to instantaneous interference or measurement randomness can be more thoroughly eliminated, significantly reducing the false trigger rate of the anti-dry-burning protection operation.

[0054] The following is another embodiment of a method for preventing dry burning in a heat pump water heater provided in this application specification.

[0055] Figure 3 Another schematic flowchart of a heat pump water heater anti-dry-burning control method provided in an embodiment of this application is shown, such as... Figure 3 As shown in the embodiments of this application, the method for preventing dry burning of a heat pump water heater includes the following steps: S310: When the heat pump water heater is running, the target temperature difference is acquired once every first time interval; S311: Determine whether the target temperature difference obtained at each first time interval meets the initial conditions. If yes, execute S312; otherwise, execute S310: Wherein, the target temperature difference is the difference between the smaller value of the upper temperature and the lower temperature of the water tank at the first time and the smaller value of the upper temperature and the lower temperature of the water tank at the second time. The second time is before the first time. The first time interval is the difference between the first time and the second time. The initial conditions include that the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature, and the first consecutive cumulative number of times the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature is greater than or equal to the first number threshold. S312: Increase the first duration to obtain the second duration, and after an interval of the second duration, obtain the first operating condition parameters, and determine the first actual heat exchange and the first theoretical heat exchange under the first operating condition parameters; wherein, the first operating condition parameters include the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature and lower water tank temperature when the second duration arrives; S313: Determine whether the first actual heat exchange and the first theoretical heat exchange determined according to the second time interval of each interval meet the first condition; if yes, execute S134; if no, execute S310; wherein, the first condition includes the first actual heat exchange being greater than or equal to the first product, the first product being the product of the first heat exchange correction coefficient and the second theoretical heat exchange, and the first heat exchange correction coefficient being greater than 1; S314: Increase the second duration to obtain the third duration, and acquire the second operating condition parameters once every third duration, and determine the second actual heat exchange and the second theoretical heat exchange under the second operating condition parameters; wherein, the second operating condition parameters include the compressor operating frequency, outdoor ambient temperature, upper water tank temperature and lower water tank temperature when the third duration arrives; S315: Determine whether the second actual heat exchange and the second theoretical heat exchange determined according to the third time interval each time satisfies the second condition; if yes, proceed to S316; if no, proceed to S310; wherein, the second condition includes the second actual heat exchange determined according to the third time interval each time being greater than or equal to the second product, and the second consecutive cumulative number of times the second actual heat exchange determined according to the third time interval each time being greater than or equal to the second product being greater than or equal to the second number threshold, the second product being the product of the second heat exchange correction coefficient and the second theoretical heat exchange, and the second heat exchange correction coefficient being greater than 1; S316: Increase the third duration to obtain the fourth duration, and obtain the third operating condition parameters every fourth duration, and determine the third actual heat exchange and the third theoretical heat exchange under the third operating condition parameters. The third operating condition parameters include the compressor operating frequency, outdoor ambient temperature, upper water tank temperature and lower water tank temperature when the fourth duration arrives. S317: Determine whether the third actual heat exchange and the third theoretical heat exchange determined according to the fourth time interval each time interval meet the third condition; if yes, proceed to S318; if no, proceed to S310; wherein, the third condition includes that the third actual heat exchange determined according to the fourth time interval each time interval is greater than or equal to the third product, and the third consecutive cumulative number of times the third actual heat exchange determined according to the fourth time interval each time interval is greater than or equal to the third product is greater than or equal to the third number threshold, the third product is the product of the third heat exchange correction coefficient and the third theoretical heat exchange, and the third heat exchange correction coefficient is greater than 1; S318: Controls the heat pump water heater to perform anti-dry-burning protection operation.

[0056] By implementing the technical solutions formed in S310 to S318, this application, upon initially detecting a risk of dry burning in the heat pump water heater, verifies the actual existence of this risk three times. If all three verifications pass, it concludes that the heat pump water heater indeed has a risk of dry burning and controls the heat pump water heater to perform anti-dry burning protection. This more thoroughly eliminates the possibility of misjudgment due to transient interference or measurement randomness in dry burning detection, significantly reducing the false trigger rate of anti-dry burning protection and improving the robustness and certainty of dry burning risk assessment. Furthermore, by setting an interval of first duration < second duration < third duration < fourth duration during the dry burning detection process, this application can effectively filter transient interference while rapidly responding to actual dry burning risks, improving the accuracy of dry burning assessment.

[0057] The following are embodiments of the apparatus described in this application, which can be used to execute the embodiments of the method described in this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the method described in this application.

[0058] Figure 4This application provides a schematic diagram of the structure of a heat pump water heater anti-dry-burning control device according to an embodiment of the present application. Figure 4 As shown, the heat pump water heater anti-dry-burning control device 400 includes: The risk assessment module 410 is used to determine whether there is a suspected risk of dry burning of the heat pump water heater when the heat pump water heater is running, based on the outdoor ambient temperature, the temperature of the upper part of the water tank and the temperature of the lower part of the water tank. The risk verification module 420 is used to verify the authenticity of the risk of dry burning of the heat pump water heater by comparing the actual heat exchange and theoretical heat exchange of the heat pump water heater under the same operating parameters when there is a suspected risk of dry burning. The safety protection module 430 is used to control the heat pump water heater to perform anti-dry-burning protection operation when the authenticity verification of the risk of dry burning of the heat pump water heater is passed.

[0059] In one possible implementation, the risk assessment module 410 is specifically used to determine at each first time interval whether the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature. The target temperature difference is the difference between the smaller of the upper and lower temperatures of the water tank at the first time and the smaller of the upper and lower temperatures of the water tank at the second time. The second time is before the first time, and the first time interval is the difference between the first and second times. If the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature, and the first consecutive cumulative number of times the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature is greater than or equal to the first number threshold, it is determined that the heat pump water heater has a suspected risk of dry burning.

[0060] In one possible implementation, the risk verification module 420 is specifically used to, when there is a suspected risk of dry burning in the heat pump water heater, acquire first operating parameters after a second time interval, and determine the first actual heat exchange and the first theoretical heat exchange under the first operating parameters. The first operating parameters include the average values ​​of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature at the time the second time interval is reached. Under the condition of satisfying the first condition, acquire second operating parameters every third time interval, and determine the second actual heat exchange and the second theoretical heat exchange under the second operating parameters. The first condition includes that the first actual heat exchange is greater than or equal to the first product, which is the product of the first heat exchange correction coefficient and the second theoretical heat exchange. The first heat exchange correction coefficient is greater than 1. The second operating parameters include the average values ​​of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature at the time the third time interval is reached. Based on the second actual heat exchange and the second theoretical heat exchange determined every third time interval, verify the authenticity of the risk of dry burning in the heat pump water heater.

[0061] In one possible implementation, the risk verification module 420 is specifically used to determine whether the authenticity verification of the heat pump water heater's dry-burning risk is passed when the second condition is met. The second condition includes that the second actual heat exchange determined at each third time interval is greater than or equal to the second product, and the second consecutive cumulative number of times the second actual heat exchange determined at each third time interval is greater than or equal to the second product is greater than or equal to the second number threshold. The second product is the product of the second heat exchange correction coefficient and the second theoretical heat exchange, and the second heat exchange correction coefficient is greater than 1. If the second condition is not met, it is determined that the authenticity verification of the heat pump water heater's dry-burning risk is not passed.

[0062] In one possible implementation, the risk verification module 420 is specifically used to acquire the third operating condition parameters every fourth time interval when the second condition is met, and determine the third actual heat exchange and the third theoretical heat exchange under the third operating condition parameters. The third operating condition parameters include the average value of the compressor operating frequency, outdoor ambient temperature, upper water tank temperature, and lower water tank temperature when the fourth time interval arrives. Based on the third actual heat exchange and the third theoretical heat exchange determined every fourth time interval, the authenticity of the risk of dry burning of the heat pump water heater is verified.

[0063] In one possible implementation, the risk verification module 420 is specifically used to determine whether the authenticity verification of the heat pump water heater's dry-burning risk is passed if the third condition is met; and to determine whether the authenticity verification of the heat pump water heater's dry-burning risk is not passed if the third condition is not met. The third condition includes that the third actual heat exchange determined at every fourth time interval is greater than or equal to the third product, and the third consecutive cumulative number of times the third actual heat exchange determined at every fourth time interval is greater than or equal to the third product is greater than or equal to the third number threshold. The third product is the product of the third heat exchange correction coefficient and the third theoretical heat exchange, and the third heat exchange correction coefficient is greater than 1.

[0064] In one possible implementation, the risk verification module 420 is specifically used to increase the first duration to obtain the second duration when there is a suspected risk of dry burning in the heat pump water heater; increase the second duration to obtain the third duration when the first condition is met; and increase the third duration to obtain the fourth duration when the second condition is met.

[0065] It should be noted that the heat pump water heater anti-dry-burning control device provided in the above embodiments is only illustrated by the division of the above functional modules when executing the heat pump water heater anti-dry-burning control method. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the heat pump water heater anti-dry-burning control device and the heat pump water heater anti-dry-burning control method embodiments provided in the above embodiments belong to the same concept. Therefore, for details not disclosed in the device embodiments of this application, please refer to the embodiments of the heat pump water heater anti-dry-burning control method of this application, which will not be repeated here.

[0066] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0067] Figure 5 This application provides a schematic diagram of the structure of a heat pump water heater according to an embodiment of the present application. Figure 5 As shown, the heat pump water heater 500 includes a memory 501 and a processor 502. The memory 501 stores executable program code 5011, and the processor 502 is used to call and execute the executable program code 5011 to perform a heat pump water heater anti-dry burning control method.

[0068] This embodiment can divide the heat pump water heater into functional modules according to the above method example. For example, each function can be assigned to a separate module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0069] When each function is divided into modules corresponding to its specific function, the heat pump water heater may include: a risk assessment module, a risk verification module, a safety protection module, etc. It should be noted that all relevant content regarding each step in the above method embodiments can be referenced from the functional descriptions of the corresponding modules, and will not be repeated here.

[0070] The heat pump water heater provided in this embodiment is used to implement the above-mentioned heat pump water heater anti-dry burning control method, and therefore can achieve the same effect as the above implementation method.

[0071] When using integrated units, a heat pump water heater may include a processing module and a storage module. The processing module is used to control and manage the operation of the heat pump water heater. The storage module supports the heat pump water heater in executing relevant program code and data.

[0072] The processing module may be a processor or a controller, which can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor may also be a combination of functions that implement computing capabilities, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc., and the storage module may be a memory.

[0073] This embodiment also provides a computer-readable storage medium storing computer program code. When the computer program code is run on a computer, the computer executes the above-described related method steps to implement a heat pump water heater anti-dry-burning control method in the above embodiment.

[0074] This embodiment also provides a computer program product. When the computer program product is run on a computer, it causes the computer to perform the above-mentioned related steps to realize a heat pump water heater anti-dry burning control method in the above embodiment.

[0075] In addition, the heat pump water heater provided in the embodiments of this application may specifically be a chip, component or module. The heat pump water heater may include a connected processor and a memory. The memory is used to store instructions. When the heat pump water heater is running, the processor can call and execute the instructions to make the chip execute a heat pump water heater anti-dry burning control method in the above embodiments.

[0076] In this embodiment, the heat pump water heater, computer-readable storage medium, computer program product or chip are all used to execute the corresponding heat pump water heater anti-dry burning control method provided above. Therefore, the beneficial effects that can be achieved can be referred to the beneficial effects in the corresponding heat pump water heater anti-dry burning control method provided above, and will not be repeated here.

[0077] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0078] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0079] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for preventing dry burning in a heat pump water heater, characterized in that, The heat pump water heater anti-dry-burning control method includes: When the heat pump water heater is running, determine whether there is a potential risk of dry burning based on the outdoor ambient temperature, the temperature of the upper part of the water tank and the temperature of the lower part of the water tank. In the event that the heat pump water heater is suspected of having a dry-burning risk, the actual heat exchange and theoretical heat exchange of the heat pump water heater under the same operating parameters are used to verify the authenticity of the dry-burning risk of the heat pump water heater. If the verification of the actual risk of dry burning of the heat pump water heater is passed, the heat pump water heater is controlled to perform anti-dry burning protection operation.

2. The method for preventing dry burning in a heat pump water heater according to claim 1, characterized in that, The method of determining whether the heat pump water heater has a suspected risk of dry burning based on the outdoor ambient temperature, the temperature of the upper part of the water tank, and the temperature of the lower part of the water tank includes: At each first time interval, it is determined whether the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature. The target temperature difference is the difference between the smaller value of the upper temperature and the lower temperature of the water tank at the first time and the smaller value of the upper temperature and the lower temperature of the water tank at the second time. The second time is before the first time, and the first time interval is the difference between the first time and the second time. If the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature, and the first consecutive cumulative number of times the target temperature difference is greater than or equal to the temperature difference threshold corresponding to the outdoor ambient temperature is greater than or equal to the first number threshold, it is determined that the heat pump water heater has a suspected risk of dry burning.

3. The method for preventing dry burning in a heat pump water heater according to claim 2, characterized in that, The verification of the existence of a dry-burning risk in the heat pump water heater based on the actual heat exchange and theoretical heat exchange under the same operating parameters includes: In the event that the heat pump water heater is suspected of dry burning, after a second time interval, the first operating condition parameters are obtained, and the first actual heat exchange and the first theoretical heat exchange under the first operating condition parameters are determined. The first operating condition parameters include the compressor operating frequency, the outdoor ambient temperature, the upper temperature of the water tank, and the lower temperature of the water tank when the second time interval is reached. Under the condition of satisfying the first condition, the second operating condition parameters are acquired every third time interval, and the second actual heat exchange and the second theoretical heat exchange under the second operating condition parameters are determined. The first condition includes the first actual heat exchange being greater than or equal to the first product, the first product being the product of the first heat exchange correction coefficient and the second theoretical heat exchange, the first heat exchange correction coefficient being greater than 1, and the second operating condition parameters including the compressor operating frequency, the outdoor ambient temperature, the upper temperature of the water tank, and the lower temperature of the water tank when the third time interval is reached. Based on the second actual heat exchange and the second theoretical heat exchange determined at each third time interval, the authenticity of the risk of dry burning of the heat pump water heater is verified.

4. The method for preventing dry burning in a heat pump water heater according to claim 3, characterized in that, The verification of the authenticity of the risk of dry burning of the heat pump water heater based on the second actual heat exchange and the second theoretical heat exchange determined at each third time interval includes: Under the condition that the second condition is met, the verification of the authenticity of the risk of dry burning of the heat pump water heater is passed. The second condition includes that the second actual heat exchange determined at each interval of the third time period is greater than or equal to the second product, and the second consecutive cumulative number of times the second actual heat exchange determined at each interval of the third time period is greater than or equal to the second product is greater than or equal to the second number threshold. The second product is the product of the second heat exchange correction coefficient and the second theoretical heat exchange, and the second heat exchange correction coefficient is greater than 1. If the second condition is not met, the verification of the authenticity of the claim that the heat pump water heater has a risk of dry burning is not successful.

5. The method for preventing dry burning in a heat pump water heater according to claim 4, characterized in that, The heat pump water heater anti-dry-burning control method also includes: Under the condition of satisfying the second condition, the third operating condition parameter is acquired once every fourth time interval, and the third actual heat exchange and the third theoretical heat exchange under the third operating condition parameter are determined. The third operating condition parameter includes the compressor operating frequency, the outdoor ambient temperature, the upper temperature of the water tank and the lower temperature of the water tank when the fourth time interval is reached. Based on the third actual heat exchange and the third theoretical heat exchange determined at each fourth time interval, the authenticity of the risk of dry burning of the heat pump water heater is verified.

6. The method for preventing dry burning in a heat pump water heater according to claim 5, characterized in that, The verification of the authenticity of the risk of dry burning of the heat pump water heater based on the third actual heat exchange and the third theoretical heat exchange determined at each fourth time interval includes: Under the condition that the third condition is met, the verification of the authenticity of the risk of dry burning of the heat pump water heater is passed. The third condition includes that the third actual heat exchange determined at each interval of the fourth time period is greater than or equal to the third product, and the third consecutive cumulative number of times the third actual heat exchange determined at each interval of the fourth time period is greater than or equal to the third product is greater than or equal to the third number threshold. The third product is the product of the third heat exchange correction coefficient and the third theoretical heat exchange, and the third heat exchange correction coefficient is greater than 1. If the third condition is not met, the verification of the authenticity of the claim that the heat pump water heater has a risk of dry burning is not successful.

7. The method for preventing dry burning in a heat pump water heater according to claim 5, characterized in that, The heat pump water heater anti-dry-burning control method also includes: In the event that the heat pump water heater is suspected of dry burning, the first duration is increased to obtain the second duration. If the first condition is met, the second duration is increased to obtain the third duration; If the second condition is met, the third duration is increased to obtain the fourth duration.

8. A heat pump water heater anti-dry-burning control device, characterized in that, The heat pump water heater anti-dry-burning control device includes: The risk assessment module is used to determine whether the heat pump water heater has a suspected risk of dry burning based on the outdoor ambient temperature, the temperature of the upper part of the water tank and the temperature of the lower part of the water tank when the heat pump water heater is running. The risk verification module is used to verify the authenticity of the risk of dry burning of the heat pump water heater by comparing the actual heat exchange and theoretical heat exchange of the heat pump water heater under the same operating parameters when the heat pump water heater is suspected of dry burning. The safety protection module is used to control the heat pump water heater to perform anti-dry-burning protection operation when the authenticity verification of the risk of dry burning of the heat pump water heater is passed.

9. A heat pump water heater, characterized in that, The heat pump water heater includes: Memory, used to store executable program code; A processor is configured to call and run the executable program code from the memory, causing the heat pump water heater to perform the heat pump water heater anti-dry burning control method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed, implements the heat pump water heater anti-dry-burning control method as described in any one of claims 1 to 7.

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